Messages in this thread | | | Date | Wed, 18 Sep 2002 14:47:41 -0700 | From | Greg KH <> | Subject | Re: Linux hot swap support |
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On Wed, Sep 18, 2002 at 05:37:50PM -0400, Bloch, Jack wrote: > At the moment, I only support removal. The way it works is as follows. > > Upon system start up my device driver detects all of the boards which are > present (I support up to six). For each board it allocates the necessary I/O > lists memory needed for operation. All addresses are then mapped to user > space with a mmap interface. Now, all HW is accessible from user space. For > each device, an ISR is installed. As soon as the ejector handle for a > particular device is opened, the board (which is a Motorola 68060 based > board) issues an interrupt to me. I will shut this board down and > de-allocate any of the previously reserved resources. What is not so easy is > to perform the insert. I thought about allocating memory becessary for a > maximum configuration, but I would still need to get the insertion event. > But anyway since our device (even though it has multiple boards internally) > is seen as a monolithic device from the main controlling host, the loss of a > single board causes it to be taken out of service.
Hm, you might want to take a look at the cPCI patches from Scott Murray, he has a solution for the resource and insertion problem that will probably work for you. You can find the patches on the pcihpd-discuss mailing list, and I think they were also posted to lkml in the past too. He's working on cleaning them up a bit for inclusion in the main kernel tree.
Hope this helps,
greg k-h - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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